Yui has been married for six months, but her sex life with her husband has completely stopped, leaving her suffering from intense sexual frustration. Still in the prime of her womanhood, she finds her desires impossible to suppress and is forced to pleasure herself. One day, she is caught in the act by Atsushi, her husband's stepson. Realizing that Atsushi has feelings for her, Yui is torn and struggles with how to handle the situation.